Here is the full list of all 43 Razenroth achievements.
Kill Meat Monster
Kill Killer Plant
Kill Gruu
Kill Spectre
Collect 1000 pieces of gold
Find magic apple
Kill Flameclaw
Buy all available things for the hut
Kill 20 mini bosses
Buy 50 items
Kill Shaman
Complete 5 quests
Find Phoenix altar
Unlock Fire elemental
Open 30 chests
Collect 500 pieces of gold
Buy 20 items
Kill 1000 monsters
Unlock Skeletor
Complete the game on hard difficulty level
Open 15 chests
Drink 50 potions
Kill Goblin Sapper
Collect 200 pieces of gold
Destroy 500 environment elements
Kill 500 monsters
Kill 5 mini bosses
Complete the game on any difficulty
Unlock grandpa
Unlock golem
Unlock Treant
Complete the game on hell difficulty level
Open 5 chests
Kill Wind Titan
Buy new thing for the hut
Kill Swamp Thing
Buy 1 item
Kill Mud Monster
Kill 100 monsters
Destroy 100 environment elements
Kill Ro'gnar
Destroy 50 environment elements
Kill Evil Tree